Feeding and burning fine fuel.



w. 0. WO0D. FEEDING AND BURNING FINE FUEL.

APPLICATION FILED MAR. 23. I9I4- I I 1,204,631 Patented Nov. 14,1916.

4 SHEETS-SHEET I.

. w. n. WOOD. FEEDING AND BURNING FINE FUEL.

APPLICATION FILED MAR. 23. 1914.

1,204,63 1 1 Patented N 0v. 14, 1916.

4 SHEETS-SHEET 2.

0000 00 00 k 0000 00 000 E 0000 000 z. 0000 000 a 0000 o o 00 000000 0-0oo'ocPSo W. D. WOOD.

FEEDING AND BURNING FINE FUEL.

APPLICATION EILED MAR. 23, 19M v v Patented N 0v. 14, 1916.

4 SHIIETSSHEE'I' 3.

N p E:

Illllllllllllllllllllllll MK I *m k W. D. WOOD.

FEEDING AND BURNING FINE FUEL.

APPLICATION FILED MAR. 23. I914.

Patented Nov. 14, 1916.

4 SHEEIS-SHEET 4- UNITED sTATEs FICE' WALTER n. woon, oF Nnw Yonx, N.Y., ASSIGNOR 'ro FUEL SAVING comrANY, or ALLnN'rowN, PENNSYLVANIA, ACORPORATION or PENNSYLVANIA.

FEEDING BURNING FINE FUEL.

To all whom it may concern:

Be it known that I, WALTER D. WOOD, a citizen of the United States,residing at Port Richmond, Staten Island, in the borough of Richmond,city and State of New York,

stances, more particularly in the furnaces used in' connection withsteam boilerses- -pecially locomotive boilersthe object be- I ing. togenerate the maximum amount of heat from a'given quantity of fuel,dispense with the necessity of much of the superintendence required withfurnaces as now constructed for the burning of fine fuel in suspension,and achieve many other desirable and useful results.

A leading feature of the invention consists in having the pressure inthe fire box less than atmospheric at all times, and in causing thedraft through the engine stack to do all the WOIk of combustion afterthe primary feed blast, by means of a carrying body of air, hasdelivered the fuel to the furnace.

The invention, therefore, consists essentially in the construction,arrangement, and

combination of parts, substantially as willbe hereinafter describedand-then more particularly pointed out in the claims.

In the accompanying drawings illustrating my invention: Figure 1 isapartial side elevation in outline only of a locomotive and .its tenderwith my present improved apparatus for burning powdered fuel appliedoperatively thereto. 2 is an enlarged side elevation of a portion of thesame, the furnace of the locomotive-and a part of the tender being shownin vertical section. Fi 3 is a top plan view of my improved fine elburner, the same being portrayed on an enlarged scale. Fig. 1 is alongitudinal section of the same on the line a, a of Fig. 3.

,Fig. 5 is a vertical cross-section of the fire box on the line I), b ofFig. 2. Fig. 6 is a detail cross-section on the line 0, c of Fig. 3,

and shows the first auxiliary air inlet. Fig. 7 is a left-hand view inelevation of the delivery nozzle for the fuel and air and the secondauxiliary airinlet with the side shutters therefor, which are depictedimmediately adjacent to the fire box in Fig. 3. Fig. 8 is a top planview of the conical mixing. chamber that receives the fuel from 'thefeed screw and transfers it to the blast channel. Fig; 9 is a verticalsection of the same with a modified form of air stirring device. Fig. 10is a vertical section of another'forni of the air stirrer. Fig. 11 is aplan view of the parts shown in Fig. 9. Fig. 12 is a plan view of theparts represented in Fig. 10.

Similar characters of reference designate corresponding parts throughoutthe differ ent figuresof the drawings.

In explaining how my improved means .for burning pulverized fuel ispractically operated, I have preferred in the present embodiment of theinvention torepresent it in connection with an ordinary steamlocomotive; but, although this is a leading embodiment of the invention,yet I'do not wish to be restricted thereto, because the improvements maybe employed in connection with any kind of a boiler or other furnacewherein it is found desirable to burn such fuel.

Hitherto it has been found diflicultto promote with entire success thecombustion and consumption of granulated or powdered fuel carried to thefurnaceunder an air or gas blast, for it has been found difiicult toproperly distribute the heat and to prevent the destruction of thebrickwork, inasmuch as the combustion point is very high and the flameisintensely hot. There have been various difiiculties also insecuring'anadequate -and properly measured air supply whichSpecification of Letters Patent. Patented N 14, 1916 i A Applicationfiled March 23, 1914. Serial No. 826,641.

will automatically adjust itself to the requirements of the quantity andcharacter of the fuel at. all times and will assist in the introductionof the requisite amountintothe fire box of the locomotive from time totime.

It is believed that with my novel arrangement of mechanism for creatinga strong blast or air pressure for blowing the fuel into the furnace tobe there burned in suspension and for automatically increasing anddiminishing the blast, and also by so arranging its effect that thedraft through the stack of the furnace will be utilized to the greatestpossible extent in creating a' v complete combustion of the fuel, I havepro transferred vided a way of introducing and burning fuel which willprove far more eflicient than other apparatus now in common use.

1 denotes a locomotive; 2, the tender which carries the fuel; and 3, thebin or receptacle on the tender for holding a large quantity of powderedor pulverized fuel which is supplied thereto through a suitablevprovided on its under side near the forward end with a short dependingspout 8, which delivers into the upper flaring end of a conical hopper9, serving as an agitating chamber, that is supportedon an air blastpipe 10, coupled to the discharge or air inlet pipe 11 of a centrifugalblower or air pump 12, which is mounted on the tender 2, alongside andpreferably in front of the fuel bin 3. The revolution of the screwconveyer 6 draws the fuel out of the receptacle 3 and carries it alongthrough the housing 7 until it reaches the spout 8 and is allowed todrop into the hopper 9, through which it gravitates into the air pipe 10and is caught by the stream of air issuing with greater or less pressurefrom the outlet 11 of the centrifugal blower 12.

Closely ad acent to the blower 12 is a steam turbine or other suitablemotor 13 which is driven preferably by steam supplied thereto throughthe pipe 14 from the boiler of the locomotive 1, the exhaust takingplace through another pipe15 running to the stack of the locomotive. Theturbine 13 applies its power to a central shaft 16, which serves as ashaft for the blower 12, as well as a shaft for the engine 13. Thisshaft extends sufficiently far beyond the blower 12 to enable it to befurnished for a certain distance with a worm 17, and beyond the worm tocarry an ordinary centrifugal governor 18'. The worm 17 meshes with aworm gear wheel l8, fixed upon a horizontal shaft 19, that is suitablysupported in bearings on the tender 2 in front of the fuel compartment3; and this shaft 19 is provided on its front end with a pinion 20 thatengages and drives a gear wheel 21 securely fastened on the outer end ofthe shaft of the screw conveyer 6, where the said' shaft ofsaid-conveyer projects through the end of the horizontal housing 7.Thus, it will be seen that the revolution of the rotary blower under theactuating power of the enginc or turbine 13, will serve to operate thefeeding mechanism whereby the fine fuel is automatically and regularlyfrom its receptacle 3 to a point in the pipe,

channel. or other conduit immediately in advance of the air blast whichis issuing with greater or less intensity fromthe discharge 11 of theblower 12. The fuel is caught up by this stream of air and thefuel-laden air is passed onward into the fire box of the locomotivethrough a nozzle having various mechanical features, and constructed andapplied for efficient service in the manner to be presently explained.

The fire box 22 of locomotive 1 is constructed in a peculiar and novelmanner for the purpose of enabling my invention to be applied thereto.The space ordinarily occupied by the grates, ash pan, etc., is replacedby an auxiliary chamber 23, depressed quite a little below the usuallevel of the bottom of the fire box (see Fig. 2), and this chamber issheathed'with fire brick. The sides 24 (see Fig. 5) slope toward thebottom 25, and said bottom itself slopes to ward an opening 26 at someparticular point, say, the forward end, below which opening 26 hangs aslag pan 27, that contains water or some other fluid, acting both as aseal to maintain a. vacuum in the fire box 22 when the engine orapparatus is in operation, and also to receive and retain any slag orother foreign matter formed in the process of combustion. Within thefire box 22 is an inclined arch 28 supported by water tubes 29,

I and having at one end, say, the rear end, an

opening 30 therein, through which the flame passes to the space abovethe arch 29 after being deflected rearwardly and upwardly by the archthrough said opening 30 by means of the powerful draft from the stack,and the flame also passes through the openings 90 of which there areusually several arranged in any desired manner.

The air and powdered fuel that are mixed in the mixing chamber in theconical hopper 9 and pipe 10, are forced into the fire box 22 through arear opening 31, into which is fitted, with an air-tight joint, acylinder 32 having its rear end closed. except for a central openingthrough which passes a pipe 33 concentric with cvlinder 32, thatconnects with the mixing chamber by means of an intermediate couplin 34,which is preferably of some thin fiexib e material, as thin metal, orleather. or canvas tubing. The end of the pipe 33 within the pipe 32 isflared so as to provide an enlarged discharge mouth 35. and this pipe 33and its flaring month are considerably less in diameter than thecylinder 32, the proportion of the diameters of the two parts beingdetermined in any suitable manner. The coupling 34 is flared at one endat 36 to inclose the contracted end 37 of the pipe 10, and a pair'ofcurved annular members 38 are riveted to each other and respectively tothe ends 36 and 37 in order to form a tight and yet flexible joint:while the other end of the coupling 34 is contracted at 3 a to bereceived within the slightly flared adjacent end 40 of the pipe 33,while another pair of curved metallic annular members 41 are riveted toeach other and respectively to the pipe ends 39 and 40,

so as to provide at this point a similar flexible connection. Thus itwill be seen that the pipes 10 and 33, with their intermediate coupling34, provide a continuous'conduit,

from the mixing chamber to the fire box,'

through which .the air and fine coal dust, or pulverized fuel, arequickly carried by the pressure of the blast generated by the fan 12,the speed and quantity of the dust-laden air being dependent, of course,upon well known conditions, and the proper proportions of the air andthe coal being maintained, it being remembered in this connection thatthe pressure within the fire box is at all times less than atmospheric.Thus the cylinder 32' and the pipe 33 which enters the same formtogether a duplex nozzle through which air and powdered coal aresupplied to the fire box to be therein flashed into an intense flame. Ofcourse, it is evi-' dent that this channel leading from the mixingchamber to the fire box may be varied -1s substantially above theordinary car buffers and couplings which are indicated at 42.

The purpose of. generating a stream of air to carry forward thepulverized fuel into the furnace of the locomotive is merely to properlycomplete the delivery ofthe fuel into the fire box and not to force itthrough the latter, because the moment the fuel reaches the fire, it isacted upon by the partial vacuum which is created 'by the draft throughthe stack of the locomotive or other en e, the pressure of the airwithin the fire ox being thus always less than atmos-' pheric pressure.Consequently it is to be borne in mind at all times that the draft fromthe stack acts on the burning'material from the moment of itsintroduction into the fire box until after the combustion is fin-.ished, or to put it perhaps more properly,

the vacuum effect of the draft through the stack causes the fuel and airmixture to burst into a fierce flame which leaps with above the arch 28,passing likewise through.

the openings 90 in the arch, and thence onward through the fire tubes 43to thoroughly heat the latter and boil the water within the water space.In actual practice, however, 1t 1s found that often a single nozzlesection like the flaring-ended section 33 will not carry suflicient airfor the quantity of fuel needed for a fire in the fire box to create andmaintain the proper steam pressure,

without making the velocity of the mixture so great as to be destructiveof the entire structure of the fire box, and without making the fanexcessively large; and asall of this fuel must becarried into the firebox through the nozzle section 33, it becomes necessary to provideautomatic means for admitting additional amounts of air into thecylinder 32 where it will meet and be combined with the coal-dustvehicle discharging fromthe flaring mouth 35;therefore, I provide thecylinder 32- with several lateral openings, preferably of circularform,'as shown at 44. Around the openings 44 and outside of the cylinder32, I constru'ct integral with or securely fastened to said cylinder 32a rectangular boxing 45 (see Fig. 6), said boxing being open at the ends46, and in these open ends are pivoted vertical blinds or shutters 47that are movable back and forth on journal pins 48, said shutters beingcapable of being opened to a greater 'or less extent in order to admitmore or less. air, and also to be entirely. closed when desired in orderto shut ofl' the entrance of any air through the openings 46.

lVhen the turbine or motor 13 runs at such speed as to cause the ballgovernor 18 to throw its arms outwardly and pull the collar 49 along onthe shaft 16 against the governor spring', it will cause a vibra tion ofthe .bell crank lever 50, which is suitably pivoted at 51, and this willdraw on a link 52 which is connected to a slotted a link 55 is in theend designated by a of the cam groove 56, the effect of pulling upon thedisk 53 and revolving it on its centralpin 57 will be to transmit motionto the link 55 and open the shutters 47 to a greater or p less extent,it being seen that the shutters are provided with arms 58 connected by alink 59, and, hence, operate in unison whenever the link 55, which ispivoted to the arm 60 attached to one of the shutter journals 48, movessaid arm 60. Thus, an increase in the supply of coal beyond a pointwhere there is enough air pressure transmitted for Said coal through thenozzle section 33, and its discharge mouth "35 will cause an action ofthe lever and other parts which will admit air through the lateralopenings 44 to whatever'extentmay be required for combustion within thecylinder 32. It furthermore happens oftentimes that even this additionalsupply of air may not be suflicient to meet the full requirements withinthe fire box 22 where the mixture that is fed into'the fire box must beinstantaneously converted into gas that is to burn with the necessaryheat, for there must be within the fire box enough air for the quantityof coal therein, and therefore I construct the front of the fire box 22with openings 61 at the opposite sides of the nozzle cylinder 32, andimmediately in front of these openings 61, I place boxes 62, which arefitted tightlv and neatly against the outer wall of the cylinder 32, andwhich have openings 63 in front (see Fig. 7) that are provided withblinds or shutters 64, there being preferably two of these shutters 64in each of the openings 63, and said shutters overlapping eachother whenclosed, as shoWn in dotted lines in Fig. 3, so as to -make a perfectlytight joint. These shutters are provided with suitable pins or pivots attop and bottom so that they can swing in a vertical plane and open the25 boxes 62 to a greater or less extent in order to permit air to passthrough the boxes 62 and through the openings 61 into the fire box 22 toperform the required service there.

- These shutters 64 are operated automatically by the governor 18 in thesame manner as are the shutters 47 belonging to the auxiliary air inlets46, and through the medium of similar levers working in conjunction withthe same disk 53, but with another cam groove 65 cut in disk 53, asshown in Fig.3. A rod 66 has at one end thereof a pin 67' which slidesin this cam groove 65. When the disk 53 is rotating in the directionshown by the arrow and is causing the rod 55 to transfer its pin 54 fromthe end a of the groove 56 to a position where the shutters 47 haveopened, the rod 66 will remain at rest since its pin 67 is lying allthis while in the concentric portion (1 of the cam groove 65, but if thedisk 53 continues to rotate after the shutters or blinds 47 have beenopened, then the pin 54 will lie in the part b of the cam groove 56,which is a concentric'part, and the rod 55 will remain at rest, butwhile this is occurring, the rod 66 will have had ,its pin 67 placed inthe part c of the cam groove 65, which part is not concentric like thepart d of said cam groove, but on the other hand is eccentric, and theresult whereof will be topush on the rod 66 and actuate the arms 68 andconnecting links 69 and 70, whereby the pivoted blinds or shutters 64are enabled to move in unison and simultaneously unclose the openings 63into the boxes 62, whereby an additional quantity of air is admitteddirectly from the atmosphere through the openings 61 into the fire box22, and thus whatever additional air'is needed for properly combiningwith the coal for proper combustion.

dust in the fire box is furnished; in fact, it

is customary to supply more air than is really needed in the combustion,this access of supply being for the purpose of keeping down thetemperature below what is injum rious. It will thus be understood thatthe fan generates a blast of carrying airWhich transports the fuel fromthe agitating or mixing chamber, or in other words, the air is loaded upby the fuel as it falls out of the conical hopper, Said fuel being thuscarried forward.

The first auxiliary inlet consisting of the lateral ports or openings inthe nozzle section 32 furnishes a volume of air which may be termedcombustion air for it is principally intended to be super-added to thecarrying air so as to provide suficient air Then the openings Whichsupply the second quantity of auxil-- iary air directly to the fire boxmay be said to furnish. an additional volume of coinbustion air for thepurposealready specified. The carrying air would, of course,

under ordinary circumstances not only be so sufiicient to be atransporting vehicle for the fuel, but would also permit some combustionthough not a complete and satisfactory burning and moreover while thesupply of combustion air will make a very satisfactory fiame in thefurnace for a'certain quantity of material, it is obvious that when thequantity is increased and the feeding augmented to a high degree,additional combustion air supplied directly to the furnace,

' as explained, is found to be a-necessary factor in successfuloperation.

The conical hopper 9 into which the powdered fuel falls. from the spout8 below screw 6- is supplied with one or more air blasts for the purposeof creating in the falling coal dust a whirling or rotary motion inorder that any lumps, aggregations or damp portions may be thoroughlybroken up and distributed throughout the interior of "the lllltl hopper9, to the end that the material may pass from said hopper into the pipe10 and on to the duplex nozzle and the fire box in as disintegrated andfine a stateas possible, thoroughly and completely suspended i151throughout the stream of air which is carrying the particles forward,and in fact presenting acomplete union of air and dust particles, Themeans for supplying currents of air to the conical hopper 9 may varybecause it. is evident a great multiplicity of different devices 'may beemployed. a

In Figs. 3, 4 and 8, ll show a pipe 71 leading from some source of airsuppl as for example, the air brake reservoir. aid pipe 71 enters thewall of the hopper 9, at a conple of oppositely-located pointscontiguous to the spout 8, so that from the mner pointed nozzles 7 2,with which the pipe 71 is prothe hopper 9 and is furnished centrallywith a downward projecting pointed-nozzle 72 which directs its blast ofair against an inverted cup 73 held. within the hopper 9 by means of ahorizontal frame 7 4 consisting of cross pieces. Another formof airinlet is represented in Fig. 10 where a pipe 71 passes through the wallof the hopper 9 and has its inner end upturned at right angles toprovide a central nozzle 72 which directs its air blast against anangular disk or plate 5, which is 'held centrally in the hop-' per 9 bymeans of cross braces 76. The

- blowing of the air strongly against the angular disk 75 or theinverted-cup 73 pro-i duces results with the .fine fuel similar. to thatproduced by the nozzles 72; but it-is quite evident that a great numberofdifi 'erent means may be devised for accomplishing the same results,the chief idea of which is to introduce one or more blasts of air intothe hopper so as to evenly distribute throughout the same the powdered;fuel which is beingdelivered into the upper end. The operation of myimproved device for igniting and burning powdered fuel in 10 comotivesand other engines, will be clearly understood from the foregoingdescription of the construction and arrangement of the various parts. Instarting the fire after the fuel has begun to feed into the furnace. nokindling will be needed, since the fuel can be easily ignited by meansof an oily waste or some rags on a stick or rod. The'separate air inletsallow air for combustion to be added to the coal dust between the blowerand the firebox, and there is, therefore, an automatic control of airand coal at all speeds. There is no necessity for the use of stokers.The flues of the boiler are kept clean and there is little liability ofleaky flues, as the fire door is kept closed. Many advantages will befound to accrue from the use of mechanism of this character, besides thegreat saving in the cost of the fuel with a corresponding increase inthe efficiency of the engine. There is no manual labor on the part ofthe firemen, so that the largest engine can be fired with perfect ease,doing away with the extra fireman often required with engines now inuse, and it will be found that the fireman can spend avery large part ofhis time in-watching signals, thereby promoting safety in the operationof the train.

Although I have primarily described the o invention in its relation to alocomotive, yet

- it will be understood that it can be, applied to other engines,stationary andotherwise.

Many modifications may be made in the exact construction and arrangementof the various parts in their relative locations, and in the severalconnections and intermediate elements, the method and plan ofmountingand sustaining the-mechanical features, etc., without exceeding thescope of the invention as it is outlined in the following claims.

Having thus described my invention, what I claim as new and desire tosecure byLetters Patent, is v 1. In an apparatus for feeding and burningpowderedfuel, the combination with a firing chamber, of a nozzle devicefor in- Y troducing fuel and air into the furnace,

said nozzle delivering fuel-carrying air and also combustion air, andconsisting essentially ofa pipe having a flaring mouth, to-

gether with another pipe surrounding said flaring mouth and of greaterdiameter and into which the flaring mo uth discharges, said second pipecommunicating with the furnace, means for creating and supplying thedust-laden current to said nozzle, and automatically controlled valvemeans for separately supplying combustion air thereto and controllingthe amount of said combustion air.

2. In an apparatus for feeding and burning powdered fuel, thecombination with a furnace, of a nozzle device for introducing fuel andair into the furnace, said nozzle delivering fuel-carrying air and alsocombustion air and consisting essentially of a pipehaving a flaringmouth, together with another pipe surrounding said flaring mouth and ofgreater diameter and into which the flaring mouth discharges, saidsecond pipe communicating with the furnace, means for creating andsupplying the dust-laden current to said nozzle, separate means forsupplying and controlling the amount of combustion air thereto, and

means for delivering and controlling the amount of additional combustionair directly to the furnace.

3,. In an apparatus for feeding and burning powdered fuel, thecombination with a steam boiler'and its furnace, in which the pressureis at all times less than atmos pheric, ofa nozzle for delivering thefuel into said furnace and consisting essentially of'a flaring dischargemember and a member of larger diameter into which said flaring dischargemember delivers, said member of larger diameter communicating with thefurnace, and said nozzle introducing dustladen air and also anadditional supply of auxiliary air to promote combustion, a fan forcreating the dust-laden current and supplying it to the nozzle, separatemeans for supplying and controlling the amount of combustion air to saidnozzle, and means for admitting and controlling the atmospheric air toserve as additional combustion air directly into the furnace.

4. In an apparatus for feeding and burning powdered fuel, thecombination with a steam boiler furnace having a depressed auxiliarychamber to enlarge the space within the furnace, of means forintroducing into said chamber a properly measured supply of fuel-ladenair, said means including a nozzle consisting essentially of a pipehaving aflaring mouth, together with a chamber of larger diametersurrounding said flaring mouth and communicating with the furnace, thecurrent of air which is demeet the combustion requirements.

5. In an apparatus for feeding and burning powdered fuel, thecombination with a firing chamber, of means for introducing a current offuel-laden air, said means including a nozzle consisting of a flaringdischarge mouth and a larger chamber surrounding the same andcommunicating with the firing chamber, a fan for creating the'fuel-laden current, separate means for mixing combustion air with thefuel-laden air before the latter reaches the firing chamber,

means for admitting combustion air directly to the firing chamber, and amixing chamber receiving air and fuel wherein a thorough intermixing ofair and fuel dust takes place-to form the dust-laden air current.

6. In an apparatusfor feeding and burning powdered fuel, the combinationwith a firing chamber, of a nozzle for introducing air and fuelthereinto, said nozzle delivering. a fuel laden stream of air and also acombustion supply and consisting essentially of a chamber-communicatingwith the firing chamber and a flaring discharge mouth delivering intosaid chamber, a mixing chamber wherein the fuel-laden stream is formedby a thorough commingling of air and fuel dust fed thereto, a rotary fanfordirecting an air blast with relation to said mixing chamber andpropelling thefuel-laden stream onward to the firing chamber.

7 In an apparatus for feeding and burning fine fuel in suspension, thecombination with a firing chamber, of a duplex nozzle consisting of aflaring discharge mouth and a chamber surrounding the same andcommunlcatlng wlth the firing chamber, said duplex nozzle delivering adust-laden stream of air and also combustion air into said firingchamber, a mixing chamber for thoroughly commingling the powdered fueland air to form said dust-laden stream, a fan for supplying air beneaththe mixing chamber, means for carrying fuel to said chamber, and meansfor feeding air to the mixing chamber.

8. In an apparatus for feeding and burning powdered fuel in suspension,the combination with a firing chamber, of a mixing chamber receivingfine fuel and also air and commingling the fuel and air therein, aduplex nozzle for admitting fuel and air into said firing chamber, saidnozzle having means for carrying and delivering dustladen air and alsoseparate means for admitting atmospheric air to mix with the dustladenair for combustion purposes, means for admitting to the firing chamberseparately from the nozzle currents of air, additional air directly fromthe atmosphere for combustion purposes, a fan for propelling thedust-laden current of air to the nozzle and firing chamber, means foroperating the fan, and a 'mechanism whereby the fan operating ineanslikewise controls the admitting and the cutting off of the combustionair.

9. In an apparatus for feeding and burning fine fuel in suspension, thecombination with a firing chamber, of a duplex nozzle for admitting fueland air thereinto, said nozzle having means for carrying the dustladenvehicle to the firing chamber and also for admitting combustion airdirectly from the atmosphere, a mixing chamber in which fine fuel andair are thoroughly commingled, a fan for propelling the dust-ladenvehicle onward to the nozzle and firing chamber, a motor for actuatingthe fan, feeding means operated by the same motor for carrying the finevfuel into the mixing chamber, and an automatic mechanism actuatedlikewise by said motor for controlling the admission and cutting off theatmospheric air supplied to the nozzle.

10. In an apparatus for feeding and burning fine fuel in suspension, thecombination with a locomotive boiler and its furnace, of a duplex nozzlefor introducing to said furnace dust-laden'air and combustion air, a fanfor creating and propelling the blast Whichtransports the fuel, a steamturbine actuating said fan and driven by steam from the locomotive, andan automatic mechanism likewise operated by the steam turbine forcontrolling the admission of the combustion air to the nozzle.

11. In an apparatus for feeding and burning finefuel in suspension, thecombination with a locomotive boiler and its furnace, of a duplex nozzlefol-introducing to said furnace dust-laden air and also combustion air,

- supply.

ing an enlarged depressed chamber to pro' vide additional space, of anozzle which introduces dust-laden air and also separately combustionair, said combustion air coming from the atmosphere, a fan for creatingand driving the dust-laden stream; a steam turbine for actuating thefan, a mixing chamber havin means for feeding air thereto and whereinthe air so fed and the fuel are thoroughly commingled, means forcarrying fuel into the mixing chamber, said means being operated by thesame steam turbine, anda mechanism likewise operated by the turbine forcontrolling the atmospheric air 13. In a fine fuel burner forlocomotives,

- the combination with a locomotive boiler and its furnace, of anauxiliary firing chamber to provide additional furnace space, a nozzlefor introducing dust-laden air and separate combustion air, saidcombustion air coming from the atmosphere, means for introducingatmospheric air directly into the fire box without passing through thenozzle, a fan, a steam turbine for driving the fan, a mixing chamberwherein air and fuel are thoroughly commingled, means for supplying airto said mixing chamber, means for carrying fuel into the mix'ingchamber,said means being operated by the same steam turbine, an automaticgovernor on the turbine shaft, -and means. actuated by the governor foropening and closing the combus: tion. air inlets on the nozzle, and alsoopening and closing the direct atmospheric air inlets to the fire box.

14. In a fine fuel burner for locomotives, the combination with alocomotive boiler and its furnace, of an auxiliary firing chamber toprovide additional furnace space, a nozzle for introducing dust-ladenair and separate combustion air, said combustion air coming from theatmosphere means for introducing atmospheric air directly into the firebox without passing through the nozzle, a fan for driving the dust-ladenair, a steam turbine for driving the fan, a mixing chamber wherein airand fuel are thoroughly commingled, means for supplying air to saidmixing chamber, means for carrying fuel into the mixing chamber, saidmeans being operated by the same steam turbine, an automatic governor ontheturbine shaft, and

the governor andbetween the cam an means actuated by the governor foropening and closing the combustion air inlets and also openihg andclosing the direct fire box atmospheric air inlets, saidmeans includingamong its essential parts a rotary camand leverage connections betweenthe cam'and the means for opening and closing the air inlets on thenozzle and the fire box;

15. In an apparatus for-' feeding and burning powdered fuel, thecombination of a furnace, a nozzle for delivering a stream W of finefuel under an air blast to the fur- 'nace, said nozzle including a pipehaving a flaring discharge mouth and a chamber surrounding said pipe andinto which the flaring mouth delivers,,said chamber entering thefurnace, a fan for generating the air blast, a conical hopper for'delivering.

'fuel to the air blast, means for feedingair into said hopper to agitatethe fuel beforeit is delivered to the air blast, a bin for containing amass of fine fuel and means for feeding the fuel from the bin to the.

hopper. v Y 16. In a fine fuel burner, the combination ofa furnace,means for delivering a stream of fuel thereinto under the actlon of anair blast, said means including a duplex nozzle having av flaringdischarge mouth and a chamber surrounding the latter in which thevelocity of the dust-laden current is reduced, means for supplyingcombustion air which may commingle with the dustladen stream, a fan forcreating the air blast, amotor for driving the fan, a hopper fordelivering the fuel to apoint in advance 'of the fan where the air andcoal may be thoroughly mixed, means for delivering a'ir into'the hopperto agitate the fuel, a fuel bin, and a feed screw leading fromthe fuelbin "to the hopper.

17. In an apparatus for burning fine fuel, the combination with a fuelbin, of a conical hopper, a feed screw for feeding fuel. from the bin tothe hopper, means for'introducing air into the hopper for the purpose ofbreaking up lumps in the coal dust, a fan for creating anair blast whichreceives the coal issuing from the bottom of the conical hopper andforms a dust-laden current'whichis propelled forward under the action ofthe air blast, a nozzle for delivering the air blast into thefurnace,shutter mechanism for admitting and regulating a supply of combustionair to said nozzle,

1 and additional shutter mechanism for regulating a supply of airdirectly to the furnace.

1E3. In a fine fuel burner, the combination of a conical hopper,'airjets entering the same for introducing currents of air to break upaggregations of coal .dust and allow it to resume its fine or comminutedcondition, a fuel bin, means for carrying the I fuel from the bin tothe'hopper consisting of a feed screw, a fan for creating a blast'of'air which receives the coal from the bota motor for driving the fan,a shaft for said motor, gearing connections between said shaft and thefeed screw, all substantially as described.

19. In a fine fuel burner, the combination of a conical hopper, meansfor introducing air thereinto to break up any lumps of coal, means forfeeding fine fuel into the hopper consisting of a feed screw and itshousing, a fan for causing a blast of air to pass beneath the hopper andreceive the dust falling therefrom, a motor for driving the fan, theshaft of the motor being the same "as that of the fan, a second shafthaving a Worm wheel actuated by a worm on the motor shaft, means forgearing the latter shaft to the feed screw shaft, all arranged so thatthe speed of the fan may control the quantity of coal fed to the hopperand to the air blast.

20. In a fine fuel burner, the combination of a hopper, means forfeeding air thereto to agitate'the fuel-dust therein, a fan forgenerating a current of air which passes beneath the hopper and receivesthe contents thereof as they fall from the hopper, a feeding mechanismfor delivering fuel to thehopper, a} motor for driving the fan, theshaft of the motor being the same as that of the fan, means forconnecting the shaft of the motor with the aforesaid feeding mechanismin order that the quantity fed by the latter may be regulated tocorrespond with the speed of the fan, and thus the quantity of air whichcarries the fine fuel may be made to correspond with the quantity offuel fed thereto, all. substantially as described, a nozzle fordelivering the dust-laden current to the furnace, means for admittingcombustion air from the at- 'mosphere to the dust-laden current in thealso for admitting combustion air directly from the atmosphere, a mixingchamber in which fine fuel and air are thoroughly commingled, a fan forpropelling the dust-laden vehicle onward to the nozzle and firingchamber, a motor for actuating the fan, and feeding means operated bythe same motor for carrying the fine fuel into the mixing chamber.

23. In a powdered fuel burner for locomotives, the combination with alocomotive boiler and its furnace, the latter having an enlargeddepressed chamber to provide additional space, of a nozzle whichintroduces dust-laden air and also separately combustion air, saidcombustion air coming from the atmosphere, a fan for creating anddriving the dust-laden stream, a steam turbine for actuating the fan, amixing chamber having means for feeding air thereto and wherein the airso fed and the fuel are thoroughly commingled, and means for carryingfuel into the mixing chamber, said means being operated by the samesteam turbine.

24. In a fine fuel burner for locomotives, the combination with alocomotive boiler and its furnace, of an auxiliary firing chamber toprovide additional furnace space, a

nozzle for introducing dust laden air and separate combustion air, saidcombustion air comin from the atmosphere, means for introducmgatmospheric air directly into the fire box without passing through thenozzle, a fan, a steam turbine for driving the fan, a mixing chamberwherein air and the fuel are thoroughly commingled, means for supplyingair to said mixing chamber, and means for carrying fuel into the mixingchamber, said means being operated by the same steam turbine.

In testimony whereof I afiix my signature in the presence of twowitnesses.

WALTER njwoon.

ESTELLE M. BRYMAN.

